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-Alola has 4 islands with a secret 5th island accessible during the post game
- The 5th islands is not considered part of Alola and houses a legendary Ghost/Water type pokemon
- Days last longer in Sun and shorter in Moon
- The starter evolutions seem to have slightly different appearances depending on the time of day they evolve. They retain the same stats and typing though.
- Rugky, a Fighting/Normal type and Rockruff share this trait.
- Marshadow is actually Malshadow and has its primary type change to match its opponent. It keeps that typing through out the battle.
- You return to kalos after you beat the game. There is a side quest where you gather Zygarde cells. Parts of the region are blocked off
- Lots of research has been done on mega evolution between XY and SM and are now sold at the Lumiose City stone shop along with the Kanto starter's stones.
- 10 new mega evolutions. 2 stones are sold, 3 are scattered around Kalos, 4 in Alola and the last in the secret island.
- The totem pokemon are Gumshoos, Lurantis, Pyroc (Fire/Flying) and Northwhal (Water/Ice)
- Certain towns have abandoned buildings or empty lots that can be made into gyms
- Certain characters from previous games can be battled and talked to in Kalos cafes. Cynthia, Wally, Green, Colress, Lance, Zinnia, and Lisia appear.
- Team Skull isn't after the legendaries.
- Lillie is a villain
- Berry Potts return.
- Alolan Raichu is unique in some way
- Difficulty settings return but keep the key system from B2W2
- Cutiefly has a split evolution.
- Many NPC's in kalos will trade regular forms for alola forms. This is the only way to get other forms without transferring.
- Gym customization is similar to secret bases but less limited.
- Trial captains and certain important characters can be recruited as gym leaders
- Guzma can be recruited
